* Battery powered with solar-assist for long life * Two independent arc sensors * Lens darkening reaction is 1/25000s * Working temperature: -5C~55C (23F ~ 130F) * Lightweight well-balanced design fully adjustable headgear provides comfort and reduces fatigue * Shade state: #9-#13 can be adjusted continuously * UV.IR protection: DIN16 * Sensitivity adjustable * Use for: Welding & grinding * Auto On/Off power * Includes replaceable cover lenses * Power supply: Solar cell and battery * Replaceable lithium battery-Cr2032